“Add the next files with correct method.” means exactly what you wrote in red box. The empty numbered line is a bug. Thanks for this report ??
Lists works as follows:
-‘Versioned CSS files’, ‘Versioned JS files’, ‘Not versioned CSS files’ and ‘Not versioned JS files’ lists are generated dynamically, this means when you open one page/post from your site, the lists are updated;
-‘Add the next files with correct method’ list is generated in relation with above lists when you push ‘Refresh’ button; This means you must push ‘Refresh’ button to see this list updated;
I will put a schedule event to update ‘Add the next files with correct method’ list every day.